Compounds > 1-1-diphenyl-2-picrylhydrazyl

1-1-diphenyl-2-picrylhydrazyl and glucogallin

1-1-diphenyl-2-picrylhydrazyl has been researched along with glucogallin* in 2 studies

Other Studies

2 other study(ies) available for 1-1-diphenyl-2-picrylhydrazyl and glucogallin

Article	Year
Activity-guided isolation of antioxidants from the leaves of Terminalia arjuna. Natural product research, 2014, Volume: 28, Issue:10 An activity-guided isolation and purification process was used to identify the l,l-diphenyl-2-picrylhydrazyl (DPPH) free radical-scavenging components of the food plant (Terminalia arjuna) of Antheraea mylitta. Dry leaves of T. arjuna were extracted with different solvents and tested for their antioxidant activity against DPPH(•). The acetone-water (8:2) extract expressed strong DPPH radical-scavenging activity, and was subjected to column chromatography over silica gel. Gallic acid, apigenin, luteolin, quercetin, epicatechin, ellagic acid and 1-O-β-galloyl glucose were isolated as active components and characterised by using different spectroscopic techniques. Topics: Antioxidants; Apigenin; Biphenyl Compounds; Catechin; Ellagic Acid; Free Radical Scavengers; Gallic Acid; Hydrolyzable Tannins; Luteolin; Molecular Structure; Nuclear Magnetic Resonance, Biomolecular; Picrates; Plant Extracts; Plant Leaves; Quercetin; Terminalia	2014
Gallic esters of sucrose as efficient radical scavengers in lipid peroxidation. Journal of agricultural and food chemistry, 2002, Jun-05, Volume: 50, Issue:12 Three tests of increasing complexity were used to assess the antioxidant activity of five synthetic gallic esters of sucrose bearing 3, 6, 7, or 8 galloyl units. In addition, two of these compounds had 1 or 2 hydrocarbon (C10-C12) acyl chains. Reaction with the DPPH radical led to the evaluation of the number of radicals trapped per galloyl unit n (3-4), as well as the apparent second-order rate constant for H atom donation k (1200-1500/M/s). These results indicated similar contribution and reactivity of all the galloyl units. Inhibition of the AAPH-initiated peroxidation of linoleic acid in a micellar medium confirmed the additive contribution of the galloyl units, whereas the presence of the hydrocarbon acyl chains had no influence. These results suggest an inhibition of initiation at high antioxidant levels and an underlying prooxidant effect of the galloyl radicals at low concentrations. Finally, LDL peroxidation was inhibited in proportion to the number of galloyl units, in agreement with the preceding tests. Topics: Amidines; Biphenyl Compounds; Esters; Free Radical Scavengers; Free Radicals; Gallic Acid; Hydrolyzable Tannins; Linoleic Acid; Lipid Peroxidation; Lipoproteins, LDL; Oxidants; Picrates; Sucrose; Tannins	2002

Article

Year

Activity-guided isolation of antioxidants from the leaves of Terminalia arjuna.

Natural product research, 2014, Volume: 28, Issue:10

An activity-guided isolation and purification process was used to identify the l,l-diphenyl-2-picrylhydrazyl (DPPH) free radical-scavenging components of the food plant (Terminalia arjuna) of Antheraea mylitta. Dry leaves of T. arjuna were extracted with different solvents and tested for their antioxidant activity against DPPH(•). The acetone-water (8:2) extract expressed strong DPPH radical-scavenging activity, and was subjected to column chromatography over silica gel. Gallic acid, apigenin, luteolin, quercetin, epicatechin, ellagic acid and 1-O-β-galloyl glucose were isolated as active components and characterised by using different spectroscopic techniques.

Topics: Antioxidants; Apigenin; Biphenyl Compounds; Catechin; Ellagic Acid; Free Radical Scavengers; Gallic Acid; Hydrolyzable Tannins; Luteolin; Molecular Structure; Nuclear Magnetic Resonance, Biomolecular; Picrates; Plant Extracts; Plant Leaves; Quercetin; Terminalia

2014

Gallic esters of sucrose as efficient radical scavengers in lipid peroxidation.

Journal of agricultural and food chemistry, 2002, Jun-05, Volume: 50, Issue:12

Three tests of increasing complexity were used to assess the antioxidant activity of five synthetic gallic esters of sucrose bearing 3, 6, 7, or 8 galloyl units. In addition, two of these compounds had 1 or 2 hydrocarbon (C10-C12) acyl chains. Reaction with the DPPH radical led to the evaluation of the number of radicals trapped per galloyl unit n (3-4), as well as the apparent second-order rate constant for H atom donation k (1200-1500/M/s). These results indicated similar contribution and reactivity of all the galloyl units. Inhibition of the AAPH-initiated peroxidation of linoleic acid in a micellar medium confirmed the additive contribution of the galloyl units, whereas the presence of the hydrocarbon acyl chains had no influence. These results suggest an inhibition of initiation at high antioxidant levels and an underlying prooxidant effect of the galloyl radicals at low concentrations. Finally, LDL peroxidation was inhibited in proportion to the number of galloyl units, in agreement with the preceding tests.

Topics: Amidines; Biphenyl Compounds; Esters; Free Radical Scavengers; Free Radicals; Gallic Acid; Hydrolyzable Tannins; Linoleic Acid; Lipid Peroxidation; Lipoproteins, LDL; Oxidants; Picrates; Sucrose; Tannins

2002